Roll-scraper



A. J. MASKREY. ROLL SCBAPER. APPLlCATlON FILED NOV= 9. 1918.

Patented Aug. 16, 1921.

2 SHEEfS-SHEET 1.

3y j M A TTORNE YS.

A. J. MASKREY.

ROLL SCRAPER.

I APPLlCATlON FILED NOV= 9, 1918. v 1,387,896 Patented Aug. 16, 1921.

2 SHEETS-SHEET 2.

IN VEN TOR.

A TTORNE vs.

UNITED, STATES PATENT OFFICE.

ARTHUR J. MASKREY, or oAN'ro oiarro.

Ro L-scRAPER.

: To all whom it may concern:

Be it known that I, A THUR J. MAsiiRnY,

acitiZen of the United States, residing at Canton, in the county ofStark and State of Ohio, have invented a new and useful Roll- Scraper,of which the following is a specifieffecting further economy in bothexpense,

time and labor, since the roll scrapers which I have devised will notneed replacing with anywhere near the frequency of the present type.

-With these objects in view the invention consists in the novelconstruction and an rangement of parts, hereinafter described,illustrated in the accompanying drawings, and particularly pointed outin the appended olaims, it being understood that various changes in theform,-proportions, size and minor details of construction may be madewithin the scope of the appended claims, without departing from thespirit or sacrificing any of the .advantages of the in: vention. .In thedrawings: 1

Figure l is a plan view of a tinning machine equipped with my rollscrapers, parts of the rolls being broken away to disclose the rollscraping devices.

Fig. 2 is a transverse sectional view on line 22, of Fig. 1. V

Fig. 3 is an enlarged detailed section of a portion of a'roll and aportion of one of the arms carrying a section of the scraper, shown inposition.

Fig. 4: is a similar View showing a modified form of scraper blade.

Fig. 5 is a still further enlargement show ing the relation of thechisel edge to the roll. I r I Similar numerals of reference indicatecorresponding parts throughout the several figures of the drawings- 4.

In the process of manufacture of tin plate, a pot containing the moltentin, is employed,

q and through this; pot are passed; the un- 7 Specification of LettersPatent. Patented Aug; Application filed November 9, 1918. Serial No.261,777.

coated sheets, pairs of, rolls being superposed above the outlet of thepot aredesigned to distribute evenly over the faces of the sheets theaccumulation of molten tin, which adheres to the sheet while pass ingthrough the tin pot. A guide way is 7 formed through the pot so that thesheets passed in at one end will be directed to a point to engage thefirst of thepairs of rolls. To those familiar with the tin platingprocess it is well known that there is always present in th molten tinwithin the tin pot,

a quantity of, minutely granular particles of foreign matter. Thisforeign substance is known as scruff and as the uncoated sheet'is passedthrough the tin pot, a quantity of this scruiP is. accumulated on-ftheface of the sheet along with the molten tin.- As the sheet is passedupwardly and comes into contact with the first of the pairs of rolls thepressure of the said rollsupon the opposite sides of the sheet willremove the surplus of molten tin, leaving the faces of the sheet coatedand returning the surplus tin to the tin pot; The scruff which wascarried upwardly on the newly coated sheet will adhere to and beaccumulated upon the surface of the rolls. Should any of thisaccumulationof scruff remain upon the rolls as it rotates and be broughtinto contact withthe face'of the sheet, the said sheet would present anunsightly appearance, the newly plated surface of the sheet appearingdull and imperfectly coated. In order to remove this accumulation ofscruff at each revolution of the rolls, a scraper is positioned tocontact with the sur-' face ofthe roll, so that a perfectly clean faceof the roll will be presented to the sheet. Passing upwardly from thefirst pair of rolls, the sheet encounters a second pair of rollsequipped with scrapers identicalwith the first pair, the operation beingrepeated substantially as on the lower rolls. The rolls upon which thescrapers embodied in this invention are applied are con tained in whatis known as the grease pot only and they receivc'the sheet after it haspassed upward through the tinning mediums These rolls are what aretermed finishing rolls and they rotate within grease, receiving thecoated sheets, and this appliance removing the surplus molten tin andespecially the scruff on the rolls, leaving the faces of the sheetscoated and returning the surplus tin andjscruif to the tin pot.

accumulation of scruff from the face of the rolls, but all of the nowknown devices employed for scraping the rolls have proven unsatisfactoryfor one reason or another; Various materials and types of scrapers havebeen discarded-for the reason that they either will not hold up underthe heat in which the scraper must work or that they-will not present aclean scraping edge. The type of scraper found most satisfactoryheretofore and the type which has been in generaluse for a number ofyears and is now generally used, is composed of asbestos and metalfabric, woven together. While the asbestos will stand up under thecontinued heat it will not long maintain a proper scraping edge toeffectively remove all ofthe scruff from the surface of the rolls. Afurther objection is that when the asbestos has worn a trifle to allowthe metal fabric to come to the surface, a series of metal points formedby the wires composing the fabric are presented to the face of the rolland constant rotation of the roll against these points of metal willeventually cause the roll tobecome roughened and rendered unfit forfurther use. Because of these objections this type of scraper must berenewed at very frequent intervals, in mills where a constant operationis maintained these changes being found necessary in about two to fourweeks and since the materials employed in constructing the scrapers areof considerable expense, the constant renewal necessary produces aninconsistently high operating expense in the manufacture of the product.

After several years of experience and experiment I have devised theherewith illustrated roll scraper which is shown applied to an ordinarytinning machine in which the tin pot designed to contain the molten tinis shown at 1. A guide 2 within the pot is designed to cause the platepassed through the molten metal to be guided into contact with thefirst'pair of rolls shown at 4. These rolls, of course, will be rotatedin the proper direction to pass a sheet brought between them from thebottom upwardly, whence the sheet is brought between the next pair ofrolls shown at 5, which are also rotating to carry the sheet upwardly. Alongitudinal beam 6 extends along either'side of the machine at a pointslightly above the top of the upper pair of rolls and to each of thesebeams is secured a plurality of downwardly extending arms 7 the saidarms being preferably equi-distantly spaced, one from the other. Thearms 7 are secured to the beam by means of bolts 8, which bolts alsosecure upon the upper side of the beams and in alinement with the arms 7a plurality of inwardly extending support plates 9. A pair of Verticallydisposed rods 10 extend through apertures formed adjacent the innerextremitiesof each of the plates 9, the said rods being threaded attheir upper extremities to receive nuts 11. l/Vashers 12 are held inplace upon each of the rods 10 by means of the nuts 11 and interposedbetween each of the washers 12 and the upper face of each of the plates9 is a coiled spring 14 which exerts an upward force upon the rod 10through its contact'with the washer upon the said rod. The lower end ofeach of the rods 10 is bifurcated and straddles an arm 15, which armsare pivoted to the arms 7. A pin is inserted through the bifurcated endsof therods 10 and through the arms 15, thus forming substantially apivotal connection between the said rods 10 and arms 15. The innerextremities 16 of the arms 15 are bent at right angles, the said bentends being secured by means of bolts 17 to a pair of longitudinalbindingstrips 18 and 19, between which binding strips is secured one of thescraper blades shown at 20. These scraper blades are formed of bardenedsteel and are beveled as at 21 to form a chisel edge 22, which chiseledge is held I against the face of the roll. The blades 20 will each bethe full length of the-rolls so that no joint is necessary.

By forming my scraper blades of bardened steel I am enabled to produce ablade which will not only stand up under the heat in which the scraperis used, but will also retain a sharp scraping edge. The hardened steelplate will always maintain an even and constant contact with the faceofthe roll and will not be easily nicked. Actual test has proven that oneof my scraper blades will continue to withstandconstant service fora'period of about one year, which taken with the fact that the initialcost of one of my blades is less than one quarter of the cost of the nowknown and employed blades, which have to be replaced about bimonthly, itis apparent that enormous economy is effected.

In Fig. 4: I have shown a slightly modified form in which I substitute aplurality of steel plates shown at 25 for the blade 20, of the otherfigures. By using this construction, should the blade which sustains thewear against the roller become damaged in any manner, it can be removedand the next blade brought to bear against the roller.

It should be noted that the scraper blades are located radially withreference to the rolls preventing the cutting of the rolls by thescrapers while at the same time the springs provided in the scrapermechanism insure an even contact between the scraper and the face of theroll. It should be understood that in time the chisel edges of thescraper blades become worn away and the edge of the scraper blade willbecome wscraper blades may be used until they are entirely worn away. wI

Having fully described my invention what I claim as new and desire tosecure by Letters Patent, is-

1. In a tin coating device comprising a. grease pot and superposed pairsof rolls therein, a pivoted arm adjacent to each roll, a radiallydisposed blade on each arm "formed from a single rigid steel plate andprovided with a chisel edge arranged to contact evenly with the face ofthe roll and tension meanscommon to the pivoted arms upon each side forholding the chisel edges of the blades in contact with'the rolls.

2. In a tin coating device comprising a grease pot and superposed pairsof rolls therein, a pivotedarm adjacent to each roll, I

a radially disposed blade on each arm formed from a single rigidsteel'plate and provided with a chisel edge arranged to contact evenlywith the face of the roll and a spring prcssed'rod connected to eachpivoted arm intermediate the ends thereof for holding the chisel edgesof the blades in contact with the rolls.

In testimony that I claim the above, I'

have hereuntosubscribed my name.

ARTHUR J. MASKREY.

